<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    setTimeout(() => {console.log("0")}, 0)
    new Promise((resolve, reject) => {
        console.log("1")
        resolve()
    }).then(() => {
        console.log("2")
        new Promise((resolve, reject) => {
            console.log("3")
            resolve()
        }).then(() => {
            console.log("4")
        }).then(() => {
            console.log("5")
        })
    }).then(() => {
        console.log("6")
    })
    new Promise((resolve, reject) => {
        console.log("7")
        resolve()
    }).then(() => {
        console.log("8")
    })
</script>
</html>